Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-12-29
1999-09-21
Maki, Steven D.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156212, 156252, 156287, 156294, B29C 6328, B29C 6336
Patent
active
059549033
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the re-lining of a sewer having a main line and at least one transverse connecting line or "lateral".
The invention is particularly applicable to the renovation of sewers and other buried pipelines, but it should be understood that it has a general application to the renovation, by re-lining, of pipelines of many different types, provided that such pipelines have one or more transversely extending connecting lines.
There are a number of methods used for the renovation of sewers and other buried pipelines, without the need for excavation, and one such method involves the insertion of resin-impregnated material into a sewer line and application of the material to the wall of the line. After a period of time, the resin cures and thereby forms an inner lining on the inner face of the sewer line which is required to be renovated.
This method is known by the generic term "cured in place pipe", and has been used successfully for a number of years for certain applications. However, there is the disadvantage that the material tends to wrinkle when the lining is formed around bends in a pipeline, and which can result in an inadequate lining layer being formed at such locations which is clearly undesirable as this will be a region of weakness and potentially inadequate sealing and which will reduce significantly the useful working life of the apparently renovated pipeline.
There is a further problem with this existing method when the material is required to be introduced into pipes of relatively small diameter, typically of diameter less than 150 mm. This problem arises by reason of the normal technique which is used in order to introduce the resin-impregnated material into the pipe, namely a technique known in the industry as "everting". This will be well-known to those of ordinary skill in the art, and therefore will not be described in detail herein. Briefly, the technique of "everting" allows for installation of a tubular re-lining layer from one end of a pipeline, and with the layer turning itself inside out as it is introduced into the pipeline under the action of a fluid actuation pressure. This technique is particularly suitable when dealing with the re-lining of "laterals" i.e. transversely extending connecting pipes running into a main sewer line, and where access is restricted.
Evidently, the connecting region between a lateral and a main line is a critical region when re-lining of the main line and of the lateral is taking place, and which is difficult to re-line and seal adequately using existing techniques.
The present invention has therefore been developed primarily with a view to addressing this problem, and to provide a unique method and system by which to solve the problem.
According to the invention there is provided a method of re-lining a main pipeline having at least one transversely extending pipe connected thereto via a generally annular connection region, said method comprising applying an internal lining to the inner wall of a length of said main pipeline and which overlies the entrance to said transversely extending pipe and also said connection region, and forming a hole in the lining so as to expose said entrance; introducing a re-lining assembly into said pipe from an end thereof remote from said entrance, said assembly comprising a tubular web of resin-permeated material within an elastomeric membrane which is everted by application of fluid pressure to the assembly so as to introduce the assembly into the pipe and so that the now externally located tubular web projects into the main pipeline; applying further fluid pressure to the assembly so that the membrane causes the projecting end of the tubular web to flare or deform outwardly and thereby overlie the connection region; and inflating a packer which is located in the main pipeline adjacent to the transversely extending pipe to engage with said flared projecting end of the tubular web and to press said end into engagement with the portion of the wall of the main pipeline adjacent to said connection region,
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